Microscope for examining pictures with rasant lateral lighting



F. PEREZ Aug; 23, 1932 AL LIGHTING -IMICROSGOPE FQR EXAHINING PICTURESWITH RASANT LATER Filed Jan. 9,A 1931 3 Sheets-Sheet 1 lll Aug. 23,1932. F. PEREZ Y HICROSCOlE FOR EXAIINING PICTURES WITHRASANT LATERAL LIFiled Jan. 9, A 1931v HTING 5 Sheets-Sheet 2 I 7, )0e-feg) /a/vevfdgPICTURES WITH RASANT LATERAL LIGHTING Aug. 23,1932. PEREZ -IICROSCOPEFOR EXAUINING 'Filed Jan) 9. 1951 :sfumata-sheetl s Patented Aug'. 23,1932 UNITED STATES PATENT OFFICE FERNANDQ rnnnz, or' ROME. ITALYnIcnoscorn non EXAMINING PICTURES WITH nAsANT LATERAI. LIGHTINGApplication iled .Tannary 9, 1931, Serial No. 507,683, and in ItalyApril1 9, 1930.

Up to now the means for examining the surface of pictures, and mostparticularly valuable oil pictures, were `rather insuliicient as onlyordinary microscopes were used i therefor, which involve moving thepictures from one place to'another. Also magnifying glasses were used,but found insuliicient for the purpose, besides which the picture wasexposed to ordinary diffused or insufficient light and did not show anyuneven or projecting details of the picture, so that no thoroughexamination of pictures such as for unevennesses was hitherto possible.

For obtaining this purpose there can be used n0 ordinary magnifyingdevices or strong lighting devices,

scopes which throw diffused light on the object under examination, butin order to put in evidence all projecting or uneven particles ofthepicture surface the latter is to be exposed to the light in a stronglyinclined, almost rasant direction.

The microscope according to invention permits of a thoroughly exactexamination 5 under magnifying variable according to necessities. Itpermits of lateral lighting from the right or left or both sides withinclination varying up to rasant angle.

By alternately varying the lightings all unevennesses projecting fromthe picture surface are exactly ascertained, which is very important,nay indispensable when it` is desired to safely restore, touch up orrenovate artistically valuable pictures, or learn the 5 special technicsof the masters.

Ilwo modifications of my invention are shown in the annexed drawings, inwhich Fig. 1 is a vertical section of apparatus, Fig. 2 a plan view,Fig.- 3 a side view, and f l Fig. 4 a' partielevation modification. A

The microscope comprises a casing 1 containin with t e lenticularsystem.

Both the upper face 3 and the lower face 4 of case 1 have a centralopening. Through the upper opening passes the optical tjibe with itscylindrical lining 5 tion wall between the lighting device and of Fig.in a such as micro-A r the right and left are obtained at the same thelighting device, and a-tube 2 f forming a parti? the lens system.Between thelower end 6 of the lining and the central opening 7 of bottom4 an empty space is therefor formed for the passage of the light beamsobliquely directed towards the lower central opening 7 of bottom 4.

In the empty space between the central lining and the lateral walls ofthe case or standard 1 the lighting device is placed comprising twoelectric lamps 8, 9 contacting With the upper surface, and two obliquereliectors or mirrors l0, l1 lixed to the bottom 4'. The light beamsfrom the lamps are reflected to the mirrors l0, 1l,4 and the .beamswhich are notvintercepted by the lining run to the central opening 7 ofthe standard bottom 4 placed over the object under examination. Thelamps may be lit by any suitable source of electric energy through aswitch 12 adjustable on three contacts. Une contact serves for the rightlamp 9, another for the left lamp 8 and the third for simultaneouslylighting both' lamps. Thus flat or rasant light beams running from theright or left, or from both time.

Between the bottom or standard 4 and the object to be examined a smallvelvet covered proj ective plate 13 with a central opening may beinserted.

The lower surface of the casing may be re-4 moved by loosening screws14, 1-5.

As shown in Fig. 4 the lining 5 may be shiftable so as to be able 'toadjust according to need the height of the small space traversed by therasant beams, by means of an 'outer ring 16 gliding in a helical groove18 of the ring on a pin 17 Iintegralwith the liningy 5.

passes through the other side of the casing and terminates in a milledcontrol knob.

In order to exclude .the light from the interior or the ap aratus bothshutters glide s in side grooves 2 28 and at the bottom engage grooves29, 30 of the upper surface of standard 4.

The upper outer surface of the shutters are graduated for being able tocontrol their 10 heights. n l

Having now particularly described and ascertained the nature of my saidinvention and in Awhat manner the same is to be performed I declare thatwhat I claim is:

.15 A microscope comprising a lens tube having an ob'ective end, acasingsurroundin the `ohjectwe end of the tube and provide with an openingtowards the object, sources of light located in said casing illuminatinggo an object from different sides boblique incident light, slide-likeshutters etween the individual source of light and the surface of theobject to be illuminated, saidl slide-like shutters being separatelyadjustablewhere- -35 by the passage available for each obliqueilluminating beam of light may be regulated or entirelyclosed-independently of the other beams of light.

.' Intestimony whereof I have hereunto 3o signed my name. FERNANDOPEREZ.

